I read an article recently about the "paleo" diet. This happened to provoke my inquiry into this word, which breaks down easily into the common usage of "old stone age". I wonder how many other daughters of PIE have continued to use either or both roots.

A friend enthusiastically embraced that diet, ignoring the critical element: people ate "natural food" acquired close by, which might or might not conform to a dietician's best-balance recommendations, and might or might not carry "natural" pathogens. In her case, the fresh fish refrigerator-freighted in from the coast is healthy, but "unnatural" for her region.